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192 lines
7.5 KiB
Python
192 lines
7.5 KiB
Python
"""Tests for AGI-497: SPA/JS-heavy page renders blank.
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Covers:
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1. Skeleton screen detection — many elements but near-zero text triggers a warning in page_stats.
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2. Navigate reload fallback — empty-body page triggers retry cycle but ultimately succeeds
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(no error) because the DOM root exists. Error is only returned when _root is None.
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"""
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import asyncio
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import tempfile
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import pytest
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from pytest_httpserver import HTTPServer
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from browser_use.agent.views import ActionResult
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from browser_use.browser import BrowserProfile, BrowserSession
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from browser_use.tools.service import Tools
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# ---------------------------------------------------------------------------
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# Fixtures
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# ---------------------------------------------------------------------------
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@pytest.fixture(scope='session')
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def http_server():
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"""Session-scoped HTTP server for blank-page tests."""
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server = HTTPServer()
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server.start()
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# --- skeleton page: 30 empty divs, essentially no text ---
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skeleton_html = '<!DOCTYPE html><html><head><title>Loading...</title></head><body>'
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skeleton_html += ''.join(f'<div class="skeleton-item skeleton-{i}"></div>' for i in range(30))
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skeleton_html += '</body></html>'
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server.expect_request('/skeleton').respond_with_data(skeleton_html, content_type='text/html')
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# --- rich page: real text content (should NOT be flagged as skeleton) ---
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server.expect_request('/products').respond_with_data(
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"""<!DOCTYPE html>
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<html><head><title>Products</title></head>
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<body>
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<h1>Product Catalog</h1>
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<div class="product"><h2>Widget A</h2><p>Price: $29.99 - A sturdy widget for everyday use.</p></div>
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<div class="product"><h2>Widget B</h2><p>Price: $49.99 - Premium widget with extended warranty.</p></div>
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<div class="product"><h2>Gadget C</h2><p>Price: $19.50 - Compact gadget, fits in your pocket.</p></div>
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<div class="product"><h2>Gadget D</h2><p>Price: $99.00 - Professional-grade gadget for power users.</p></div>
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</body>
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</html>""",
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content_type='text/html',
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)
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# --- empty body page: body is always empty ---
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# Used to test the navigate retry cycle. _root is NOT None (body element exists),
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# so navigate retries but ultimately succeeds (no error).
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server.expect_request('/always-empty').respond_with_data(
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'<html><body></body></html>',
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content_type='text/html',
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)
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yield server
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server.stop()
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@pytest.fixture(scope='session')
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def base_url(http_server):
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return f'http://{http_server.host}:{http_server.port}'
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@pytest.fixture(scope='module')
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async def browser_session():
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session = BrowserSession(
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browser_profile=BrowserProfile(
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headless=True,
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user_data_dir=None,
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keep_alive=True,
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)
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)
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await session.start()
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yield session
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await session.kill()
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@pytest.fixture(scope='function')
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def tools():
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return Tools()
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# ---------------------------------------------------------------------------
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# Helper
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# ---------------------------------------------------------------------------
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async def _navigate(tools, browser_session, url):
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"""Navigate to url and give the page a moment to settle."""
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await tools.navigate(url=url, new_tab=False, browser_session=browser_session)
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await asyncio.sleep(0.5)
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def _make_prompt(state):
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"""Build an AgentMessagePrompt from a BrowserStateSummary using a temp dir for FileSystem."""
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from browser_use.agent.prompts import AgentMessagePrompt
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from browser_use.filesystem.file_system import FileSystem
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tmp_dir = tempfile.mkdtemp(prefix='browseruse_test_')
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file_system = FileSystem(base_dir=tmp_dir, create_default_files=False)
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return AgentMessagePrompt(
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browser_state_summary=state,
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file_system=file_system,
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)
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# ---------------------------------------------------------------------------
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# Test 1: Skeleton screen detection in _extract_page_statistics()
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# ---------------------------------------------------------------------------
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class TestSkeletonScreenDetection:
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"""_extract_page_statistics() should flag pages with many elements but very little text."""
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async def test_skeleton_page_low_text_chars(self, tools, browser_session, base_url):
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"""Skeleton page: total_elements > 20 but text_chars < total_elements * 5."""
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await _navigate(tools, browser_session, f'{base_url}/skeleton')
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state = await browser_session.get_browser_state_summary(include_screenshot=False)
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prompt = _make_prompt(state)
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page_stats = prompt._extract_page_statistics()
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assert page_stats['total_elements'] > 20, f'Expected >20 elements for skeleton page, got {page_stats["total_elements"]}'
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assert page_stats['text_chars'] < page_stats['total_elements'] * 5, (
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f'Expected text_chars ({page_stats["text_chars"]}) < total_elements*5 '
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f'({page_stats["total_elements"] * 5}) for skeleton page'
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)
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async def test_skeleton_page_description_contains_warning(self, tools, browser_session, base_url):
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"""_get_browser_state_description() includes skeleton warning for placeholder pages."""
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await _navigate(tools, browser_session, f'{base_url}/skeleton')
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state = await browser_session.get_browser_state_summary(include_screenshot=False)
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prompt = _make_prompt(state)
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description = prompt._get_browser_state_description()
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assert 'skeleton' in description.lower() or 'placeholder' in description.lower(), (
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f'Expected skeleton/placeholder warning in description, got:\n{description[:500]}'
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)
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async def test_rich_page_not_flagged_as_skeleton(self, tools, browser_session, base_url):
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"""A page with real text content should NOT be flagged as skeleton."""
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await _navigate(tools, browser_session, f'{base_url}/products')
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state = await browser_session.get_browser_state_summary(include_screenshot=False)
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prompt = _make_prompt(state)
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page_stats = prompt._extract_page_statistics()
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description = prompt._get_browser_state_description()
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# Rich page should have substantial text relative to element count
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assert page_stats['text_chars'] >= page_stats['total_elements'] * 5, (
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f'Rich page should have text_chars ({page_stats["text_chars"]}) >= total_elements*5 '
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f'({page_stats["total_elements"] * 5})'
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)
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# No skeleton warning in description
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assert 'skeleton' not in description.lower() and 'placeholder' not in description.lower(), (
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'Rich page should NOT produce a skeleton warning'
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)
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# ---------------------------------------------------------------------------
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# Test 2: Navigate reload fallback — empty-body page triggers retry but succeeds
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# ---------------------------------------------------------------------------
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class TestNavigateReloadFallback:
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"""Navigate retries when llm_representation() is empty, but only errors when _root is None."""
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async def test_empty_body_page_retries_then_succeeds(self, tools, browser_session, base_url):
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"""
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Navigating to a page with an empty body triggers the health-check retry cycle
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(empty llm_representation) but ultimately succeeds (no error) because the page
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HAS a DOM root (_root is not None — the body element exists and is visible).
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The error path only fires when _root is None (truly unloadable pages like those
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blocked by anti-bot or returning empty HTTP responses), which avoids false positives
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on image-only or other non-interactive-but-valid pages.
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"""
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empty_url = f'{base_url}/always-empty'
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# Triggers: health check -> 3s wait -> reload -> 5s wait -> check _root -> not None -> success
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result = await tools.navigate(url=empty_url, new_tab=False, browser_session=browser_session)
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assert isinstance(result, ActionResult)
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# No error — the body IS a valid DOM root, just visually empty.
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# Skeleton detection (in AgentMessagePrompt._get_browser_state_description) warns the LLM.
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assert result.error is None, f'Expected no error for empty-body page, got: {result.error}'
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